Improvement of AMS system at Kyushu University

Abstract Beam optics, charging system and voltage control system of the tandem accelerator at Kyushu University were modified for AMS which requests the high beam transmission for the measurements with high precision and reproducibility for the ratio of 14 C/ 12 C. The transmission of the 12 C beams at the terminal voltage of 6 MV reached 48% using the stripper carbon foil of 7 μg/cm 2 .